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Investments - Summary of Available-for-Sale Debt Securities and Equity Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales and maturities (fair value) $ 61,658 $ 57,169 $ 114,291 $ 99,682
Proceeds from sales of equity securities 3,589 0 5,165 0
Gross realized gains on sale of securities 895 540 1,017 886
Equity securities, FV-NI, Realized Gain 741 0 1,084 0
Gross realized losses on sale of securities (1,140) (372) (1,464) (419)
Equity securities, FV-NI, Realized Loss 0 0 0 0
Realized gains on sales of investment real estate $ 0 $ 0 $ 401 $ 0